🏷️ Basic Information Identification Make: BMW Model: R100 Year: 1990 Sub Model: R100GS, R100R, R100RS, R100RT, R100S Codes Engine Code Prefix: 117EA 👋 Introduction Market Position Target Audience: Professional motorcycle technicians, experienced DIY enthusiasts, and owners seeking in-depth knowledge of their BMW R100. Competitive Analysis Value Proposition: Provides essential, often hard-to-find, technical data and procedures for maintaining and repairing a classic BMW motorcycle, crucial for preserving its value and performance. Key Features Manual Benefits: Enables accurate diagnosis, efficient repair, proper maintenance, and safe operation of the BMW R100. 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive repair and service for BMW R100 series motorcycles manufactured in 1990. Secondary Coverage: Includes troubleshooting, diagnostics, maintenance, adjustments, and disassembly/reassembly procedures. Page Count Estimated Page Count: 300-400 pages (estimated for a comprehensive manual of this type) Manual Type Manual Type: Repair Service Manual Language Language: English Format Format: PDF (Downloadable) 📖 Manual Coverage Systems Covered Engine Systems: Engine overhaul, cylinder head, valve train, piston, connecting rods, crankshaft, oil pump, lubrication system, cooling system (air-cooled design), fuel injection/carburetion. Transmission Systems: Gearbox inspection, repair, clutch assembly, drive shaft, final drive. Electrical Systems: Ignition system, charging system (alternator, regulator), lighting, starter motor, battery, wiring diagrams, control units. Chassis And Suspension: Front fork (including specific variants like Monolever for GS), rear suspension (Monolever), wheel bearings, steering head bearings, frame inspection. Braking Systems: Front and rear brake systems (disc brakes), brake fluid replacement, caliper service, master cylinder. Fuel And Exhaust: Fuel tank, fuel lines, fuel pump (if applicable), exhaust system maintenance and repair. Bodywork And Trim: Fairings, seat, fuel tank mounting, fenders, mirrors, control levers. Procedures Included Maintenance Procedures: Oil and filter changes, spark plug replacement, air filter cleaning/replacement, valve clearance adjustment, brake bleeding, tire pressure checks, drive shaft lubrication. Troubleshooting Diagnostics: Step-by-step diagnostic flowcharts for common problems (e.g., starting issues, poor running, electrical faults). Repair Procedures: Detailed instructions for component replacement and overhaul, including torque specifications for critical fasteners. Assembly Disassembly: Complete breakdown and reassembly guides for major components and the entire motorcycle. Technical Depth Depth Level: Advanced, suitable for professional technicians and experienced DIY mechanics. Diagnostic Capability: Covers diagnostic procedures for both mechanical and electrical systems, often referencing specific test equipment or methods. Rebuild Guidelines: Includes specifications and procedures for complete engine and transmission rebuilds. 📊 Manual Specifications File Format File Format: Searchable PDF Print Quality Resolution: High resolution, suitable for printing individual pages or the entire manual. Binding Type Binding Type For Print: N/A (Digital Download) Paper Type Paper Type For Print: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, four-stroke, horizontally opposed twin-cylinder boxer engine. Bore X Stroke: 98 mm x 70.5 mm (for most R100 variants) Displacement: 980 cc (980 cm³) Compression Ratio: Typically 8.5:1 or 9.5:1 depending on specific model and tune. Performance Horsepower: Approx. 65-70 HP at 7250 rpm (varies by model, e.g., R100GS, R100RT). Torque: Approx. 75-78 Nm (55-58 lb-ft) at 5500 rpm (varies by model). Fuel System Fuel Delivery: Dual Bing constant-velocity carburetors (e.g., 32mm or 40mm depending on model) or Bosch LE-Jetronic fuel injection (on later models like R100RT). Fuel Type: Unleaded gasoline, minimum 91 octane (RON+MON)/2. Lubrication Oil Type: SAE 20W-50 or SAE 10W-40, API SF/SG classification (refer to specific manual recommendations). 🔧 Transmission Standard Gearbox Type: 5-speed manual constant-mesh transmission. Clutch Type: Single dry plate clutch, operated hydraulically. Features Drive System: Shaft drive to the rear wheel. Gear Ratios: Specific ratios vary by model, detailed in the manual (e.g., 1st gear, final drive ratio). Transmission Oil: Gearbox oil specification (e.g., SAE 75W-90 GL-5) and capacity as per manual. 📐 Dimensions Exterior Wheelbase: Approximately 1430 mm (56.3 in) for R100RS/RT, longer for R100GS. Weights Dry Weight: Approx. 220-240 kg (485-529 lbs) depending on model (R100GS typically heavier). Gross Vehicle Weight Rating: Refer to owner's manual or specific model documentation. 🛡️ Safety Features Ratings Crash Test Results: N/A (Motorcycle safety ratings are not standardized in the same way as cars). Active Features Braking System: Hydraulically operated disc brakes front and rear (e.g., Brembo). Suspension Features: Anti-dive mechanisms or adjustable damping (on some models) contribute to stable handling. Passive Features Frame Construction: Robust steel tube frame provides structural integrity. 💡 Technology Features Infotainment Infotainment System: N/A (This era of BMW motorcycle did not feature integrated infotainment systems). Driver Assistance ABS Availability: ABS was an optional feature on some R100 models, particularly the R100RT and R100RS, from the late 1980s onwards. Connectivity Connectivity Features: N/A (No electronic connectivity features). 🔧 Maintenance Service Intervals Oil Change Interval: Every 5,000 - 10,000 km (3,000 - 6,000 miles) or annually, whichever comes first (refer to manual). Valve Adjustment Interval: Every 10,000 - 20,000 km (6,000 - 12,000 miles) or as indicated by performance. Gearbox Oil Change: Every 20,000 - 40,000 km (12,000 - 24,000 miles). Fluid Specifications Brake Fluid: DOT 3...